I just tried another USB-C to HDMI adapter from a friend without any issues.
I believe now that this isn't a problem with the kernel but the adapter.
The issue can probably be closed.

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  Display resolution of monitor via HDMI incorrectly identified

Status in linux package in Ubuntu:

Bug description:
  I use a Philips BDM4037U 40'', 4k monitor.
  Connecting it via DP to my Lenovo 910 4k does work (except for random display 

  But when connecting it via HDMI the display resolution is sometimes
  correctly set (I cannot see a pattern when this works) but sometimes
  the display resolution is just set to FullHD, 1920x1080 Pixel @ 60Hz.

  Due to limitations of the supported HDMI protocol on my laptop I can
  only drive the display with 30Hz when in 4k mode. Which is totally
  fine for me. But this mode isn't correctly identified, most of the

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-13-generic 4.15.0-13.14 [modified: 
  ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
  Uname: Linux 4.15.0-13-generic x86_64
  ApportVersion: 2.20.9-0ubuntu4
  Architecture: amd64
   /dev/snd/controlC0:  thet       1429 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Apr 11 12:00:28 2018
  HibernationDevice: RESUME=UUID=bedd1248-32dd-43ca-be9f-28337086ea86
  InstallationDate: Installed on 2018-04-09 (1 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Beta amd64 (20180404)
  MachineType: LENOVO 80VF
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-13-generic.efi.signed 
root=UUID=998520ff-c841-45ab-8312-2bb876ae2a0b ro quiet splash vt.handoff=1
   linux-restricted-modules-4.15.0-13-generic N/A
   linux-backports-modules-4.15.0-13-generic  N/A
   linux-firmware                             1.173
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/31/2017
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 2JCN39WW
  dmi.board.asset.tag: NO Asset Tag
  dmi.board.name: Agera
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40709 WIN
  dmi.chassis.asset.tag: NO Asset Tag
  dmi.chassis.type: 31
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo YOGA 910-13IKB
  dmi.product.family: IDEAPAD
  dmi.product.name: 80VF
  dmi.product.version: Lenovo YOGA 910-13IKB
  dmi.sys.vendor: LENOVO

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